How often does a President admit he is wrong?

The character of Abraham Lincoln, which has made him arguably the best President of the United States, has been the subject of many books. One bit of evidence can be found in the September 5, 1863 issue of the “Army & Navy Journal” which contains a famous letter to General U.S. Grant (see below).

In this remarkable letter, President Abraham Lincoln congratulates General Grant for an important victory — the capture of Vicksburg, Mississippi, on July 4, 1863. Lincoln differed with Grant about how to handle the campaign, but when Grant pursued his own strategy successfully, Lincoln frankly admitted that Grant was right.